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using Gee;
using Gtk;

using Dino.Entities;

namespace Dino.Ui.OccupantMenu{

[GtkTemplate (ui = "/im/dino/occupant_list.ui")]
public class List : Box {

    public signal void conversation_selected(Conversation? conversation);
    private StreamInteractor stream_interactor;

    [GtkChild] public ListBox list_box;
    [GtkChild] private SearchEntry search_entry;

    private Conversation conversation;
    private string[]? filter_values;
    private HashMap<Jid, ListRow> rows = new HashMap<Jid, ListRow>(Jid.hash_func, Jid.equals_func);

    public List(StreamInteractor stream_interactor, Conversation conversation) {
        this.stream_interactor = stream_interactor;
        list_box.set_header_func(header);
        list_box.set_sort_func(sort);
        list_box.set_filter_func(filter);
        search_entry.search_changed.connect(search_changed);

        stream_interactor.get_module(PresenceManager.IDENTITY).show_received.connect(on_show_received);
        stream_interactor.get_module(RosterManager.IDENTITY).updated_roster_item.connect(on_updated_roster_item);

        initialize_for_conversation(conversation);
    }

    public void initialize_for_conversation(Conversation conversation) {
        this.conversation = conversation;
        Gee.List<Jid>? occupants = stream_interactor.get_module(MucManager.IDENTITY).get_occupants(conversation.counterpart, conversation.account);
        if (occupants != null) {
            foreach (Jid occupant in occupants) {
                add_occupant(occupant);
            }
        }
    }

    private void refilter() {
        string[]? values = null;
        string str = search_entry.get_text ();
        if (str != "") values = str.split(" ");
        if (filter_values == values) return;
        filter_values = values;
        list_box.invalidate_filter();
    }

    private void search_changed(Editable editable) {
        refilter();
    }

    public void add_occupant(Jid jid) {
        rows[jid] = new ListRow(stream_interactor, conversation.account, jid);
        list_box.add(rows[jid]);
        list_box.invalidate_filter();
        list_box.invalidate_sort();
    }

    public void remove_occupant(Jid jid) {
        list_box.remove(rows[jid]);
        rows.unset(jid);
    }

    private void on_updated_roster_item(Account account, Jid jid, Xmpp.Roster.Item roster_item) {

    }

    private void on_show_received(Show show, Jid jid, Account account) {
        if (conversation != null && conversation.counterpart.equals_bare(jid)) {
            if (show.as == Show.OFFLINE && rows.has_key(jid)) {
                remove_occupant(jid);
            } else if (show.as != Show.OFFLINE && !rows.has_key(jid)) {
                add_occupant(jid);
            }
        }
    }

    private void header(ListBoxRow row, ListBoxRow? before_row) {
        ListRow c1 = row as ListRow;
        Xmpp.Xep.Muc.Affiliation? a1 = stream_interactor.get_module(MucManager.IDENTITY).get_affiliation(conversation.counterpart, c1.jid, c1.account);
        if (a1 == null) return;

        if (before_row != null) {
            ListRow c2 = (ListRow) before_row;
            Xmpp.Xep.Muc.Affiliation? a2 = stream_interactor.get_module(MucManager.IDENTITY).get_affiliation(conversation.counterpart, c2.jid, c2.account);
            if (a1 != a2) {
                row.set_header(generate_header_widget(a1, false));
            } else if (row.get_header() != null){
                row.set_header(null);
            }
        } else {
            row.set_header(generate_header_widget(a1, true));
        }
    }

    private Widget generate_header_widget(Xmpp.Xep.Muc.Affiliation affiliation, bool top) {
        string aff_str;
        switch (affiliation) {
            case Xmpp.Xep.Muc.Affiliation.OWNER:
                aff_str = _("Owner"); break;
            case Xmpp.Xep.Muc.Affiliation.ADMIN:
                aff_str = _("Admin"); break;
            case Xmpp.Xep.Muc.Affiliation.MEMBER:
                aff_str = _("Member"); break;
            default:
                aff_str = _("User"); break;
        }

        int count = 0;
        foreach (ListRow row in rows.values) {
            Xmpp.Xep.Muc.Affiliation aff = stream_interactor.get_module(MucManager.IDENTITY).get_affiliation(conversation.counterpart, row.jid, conversation.account);
            if (aff == affiliation) count++;
        }

        Label title_label = new Label("") { margin_start=10, xalign=0, visible=true };
        title_label.set_markup(@"<b>$(Markup.escape_text(aff_str))</b>");

        Label count_label = new Label(@"$count") { xalign=0, margin_end=7, expand=true, visible=true };
        count_label.get_style_context().add_class("dim-label");

        Grid grid = new Grid() { margin_top=top?5:15, column_spacing=5, hexpand=true, visible=true };
        grid.attach(title_label, 0, 0, 1, 1);
        grid.attach(count_label, 1, 0, 1, 1);
        grid.attach(new Separator(Orientation.HORIZONTAL) { expand=true, visible=true }, 0, 1, 2, 1);
        return grid;
    }

    private bool filter(ListBoxRow r) {
        if (r.get_type().is_a(typeof(ListRow))) {
            ListRow row = r as ListRow;
            foreach (string filter in filter_values) {
                return row.name_label.label.down().contains(filter.down());
            }
        }
        return true;
    }

    private int sort(ListBoxRow row1, ListBoxRow row2) {
        if (row1.get_type().is_a(typeof(ListRow)) && row2.get_type().is_a(typeof(ListRow))) {
            ListRow c1 = row1 as ListRow;
            ListRow c2 = row2 as ListRow;
            int affiliation1 = get_affiliation_ranking(stream_interactor.get_module(MucManager.IDENTITY).get_affiliation(conversation.counterpart, c1.jid, c1.account) ?? Xmpp.Xep.Muc.Affiliation.NONE);
            int affiliation2 = get_affiliation_ranking(stream_interactor.get_module(MucManager.IDENTITY).get_affiliation(conversation.counterpart, c2.jid, c2.account) ?? Xmpp.Xep.Muc.Affiliation.NONE);
            if (affiliation1 < affiliation2) return -1;
            else if (affiliation1 > affiliation2) return 1;
            else return c1.name_label.label.collate(c2.name_label.label);
        }
        return 0;
    }

    private int get_affiliation_ranking(Xmpp.Xep.Muc.Affiliation affiliation) {
        switch (affiliation) {
            case Xmpp.Xep.Muc.Affiliation.OWNER:
                return 1;
            case Xmpp.Xep.Muc.Affiliation.ADMIN:
                return 2;
            case Xmpp.Xep.Muc.Affiliation.MEMBER:
                return 3;
            default:
                return 4;
        }
    }
}

}